This natural finish billet aluminum backing plate is compatible with any electric water pump that mounts to the stock Chrysler timing cover. This backing plate is INCLUDED with all PROFORM Chrysler S/B Electric Water Pumps. Product Features:Small Block Mopar EnginesMade from High-Quality Billet AluminumNatural FinishWork with Any Electric Water Pump Where the Engine uses the Stock-Style Timing Cover1-inch Stud Length